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Area of Science:

  • Physics
  • Materials Science
  • Acoustics

Background:

  • Dense granular suspensions exhibit complex acoustic properties.
  • Understanding wave propagation in disordered media is crucial for various applications.

Purpose of the Study:

  • To demonstrate and explain acoustic transparency in granular suspensions.
  • To investigate the role of structural disorder correlations in wave transmission.
  • To challenge existing models of acoustic absorption in dense media.

Main Methods:

  • Experimental demonstration of acoustic transparency using ultrasound pulses.
  • Theoretical modeling incorporating spatial correlations via the structure factor.
  • Comparison with the generalized coherent potential approximation (GCPA) model.

Main Results:

  • A distinct frequency band of acoustic transparency was observed in 2D and 3D granular suspensions.
  • The phenomenon is linked to spatial correlations in the medium's structural disorder.
  • Attenuation within the transparency band is primarily due to absorption, not scattering.
  • Measured absorption coefficients deviate significantly from conventional models.

Conclusions:

  • Spatial correlations in structural disorder are key to acoustic transparency in granular media.
  • Existing models may need revision to accurately describe acoustic absorption in dense granular systems.
  • This finding opens new avenues for controlling acoustic wave propagation in disordered materials.